class_docstr: ParameterSystem is a subclass of GroupParameter that manages a tree of 
  sub-parameters with a set of interdependencies--changing any one parameter
  may affect other parameters in the system.
  
  See parametertree/SystemSolver for more information.
  
  NOTE: This API is experimental and may change substantially across minor 
  version numbers. 
code: def updateAllParams(self):
      try:
          self.sigTreeStateChanged.disconnect(self.updateSystem)
          for name, state in self._system._vars.items():
              param = self.child(name)
              try:
                  v = getattr(self._system, name)
                  if self._system._vars[name][2] is None:
                      self.updateParamState(self.child(name), "autoSet")
                      param.setValue(v)
                  else:
                      self.updateParamState(self.child(name), "fixed")
              except RuntimeError:
                  self.updateParamState(param, "autoUnset")
      finally:
          self.sigTreeStateChanged.connect(self.updateSystem)
  
file_path: pyqtgraph/pyqtgraph/parametertree/ParameterSystem.py
imports: from ..None import functions
  from .parameterTypes import GroupParameter
  from .SystemSolver import SystemSolver
label_desc: Use image node_id 4 for calling the ParameterSystem obj's underlying member method code with example usage: obj.updateAllParams() without return types